(CNN) -- As U.S. forces in Pakistan swooped in on Osama bin Laden on Sunday, at least one Twitter user was unknowingly reporting details of the raid.

Some of the first public accounts of the military operation that killed the terrorist leader came in the form of tweets from Sohaib Athar, a 33-year-old IT consultant in Abbottabad, the city where bin Laden was found.

But the significance of Athar's posts wouldn't be clear until hours later when users of the social-networking site -- and the rest of the world -- learned of President Barack Obama's plans for a rare, late-night address to announce that bin Laden had been killed.

The first clue from Athar came after 4 p.m. ET Sunday. That was after midnight in Pakistan, but Athar was attentive because he often writes code overnight for American companies and sleeps during the day, he told CNN in an interview.

But soon, it was clear that more was going on than a random flyover. He reported seeing an airplane fly overhead, and later heard a vehicle driving very quickly, he said in an interview.

The ruckus was "not very usual for sleepy little Abbottabad," Athar said in an interview. "People go to sleep at 9 p.m. every night, and they drive very slow because of the hilly terrain."

Athar worried, as most anyone would, that terrorism might be involved.

"A huge window shaking bang here in Abbottabad," Athar wrote on Twitter. "I hope its not the start of something nasty."

He posted an incorrect local media report that a helicopter had crashed, or had been shot down (perhaps jokingly, calling it a UFO) and gave details of military cordoning off areas of the city.

Then, about eight hours after his first tweet, Athar acknowledged that he'd heard what happened.

"I guess I should unsubscribe from the #abbottabad search on twitter before it kills my machine," he wrote. "Leave Abbottabad alone, Osama and Obama."

According to what appears to be Athar's Facebook profile (it also lists him as a consultant and links to a personal website with the same name as his Twitter profile), he graduated from the University of the Punjab in Lahore, Pakistan, in 2001.

He also earned an MBA from Preston University, an online school headquartered in the United States, it says. His public profile page lists his religious views as "Myopic" and political views as "Anarchistic."

By early Monday in the United States, the online deluge for the man who also runs a small coffee shop was just beginning. As his tweets were discovered, the online messages and media requests began.